U.S. patent number 10,061,159 [Application Number 15/229,626] was granted by the patent office on 2018-08-28 for light-emitting apparatus and image display apparatus with a partition member separating adjacent light source units.
This patent grant is currently assigned to Canon Kabushiki Kaisha. The grantee listed for this patent is CANON KABUSHIKI KAISHA. Invention is credited to Masahiro Kamiyoshihara, Takuma Kanno.
United States Patent |
10,061,159 |
Kamiyoshihara , et
al. |
August 28, 2018 |
Light-emitting apparatus and image display apparatus with a
partition member separating adjacent light source units
Abstract
A light-emitting apparatus according to the present invention
includes: a board on which a plurality of light source units are
provided; a partition member provided on the board and enclosing
each of the light source units; and a fixing member arranged in a
boundary portion between two or more light source units that are
adjacent to each other and fixing the board and the partition
member.
Inventors: |
Kamiyoshihara; Masahiro
(Kamakura, JP), Kanno; Takuma (Tokyo, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
CANON KABUSHIKI KAISHA |
Tokyo |
N/A |
JP |
|
|
Assignee: |
Canon Kabushiki Kaisha (Tokyo,
JP)
|
Family
ID: |
57996006 |
Appl.
No.: |
15/229,626 |
Filed: |
August 5, 2016 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20170045779 A1 |
Feb 16, 2017 |
|
Foreign Application Priority Data
|
|
|
|
|
Aug 11, 2015 [JP] |
|
|
2015-158721 |
Jun 14, 2016 [JP] |
|
|
2016-117664 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F
1/133608 (20130101); G02F 1/133603 (20130101) |
Current International
Class: |
G02F
1/1335 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Green; Tracie Y
Attorney, Agent or Firm: Cowan, Liebowitz & Latman,
P.C.
Claims
What is claimed is:
1. A light-emitting apparatus comprising: a board on which a
plurality of light source units are provided; a partition member
provided on the board and enclosing each of the plurality of light
source units; and a fixing member arranged in a boundary portion
between two or more light source units that are adjacent to each
other and fixing the board and the partition member, wherein the
partition member is a sheet member which separates each of the
plurality of light source units from adjacent light source units,
in the boundary portion between the two or more light source units,
a space is formed between the partition member and the board, and
the fixing member is provided in the space.
2. The light-emitting apparatus according to claim 1, wherein the
partition member is a member which reflects light from each light
source unit toward the adjacent light source units.
3. The light-emitting apparatus according to claim 1, wherein a
first fixing portion to be fixed to the board is provided at one
end of the fixing member, and a second fixing portion to be fixed
to the partition member is provided at another end of the fixing
member.
4. The light-emitting apparatus according to claim 3, wherein the
partition member includes an opening at a position where the fixing
member is provided, and the second fixing portion passes through
the opening of the partition member and holds the partition
member.
5. The light-emitting apparatus according to claim 4, wherein the
fixing member includes: a first member having at one end thereof
the first fixing portion and having another end thereof a first
screw portion; and a second member having a second screw portion to
be screwed to the first screw portion provided on the first member,
and the partition member is held by screwing the second screw
portion of the second member to the first screw portion of the
first member through the opening of the partition member.
6. The light-emitting apparatus according to claim 3, wherein the
board includes a third screw portion at a position where the fixing
member is provided, and the first fixing portion is a fourth screw
portion to be screwed to the third screw portion of the board.
7. The light-emitting apparatus according to claim 3, further
comprising a plate-shaped optical member provided on the partition
member, wherein the optical member is fixed by adhesion to the
second fixing portion.
8. The light-emitting apparatus according to claim 1, further
comprising a plate-shaped optical member provided on the partition
member, wherein a first fixing portion to be fixed to the board is
provided at one end of the fixing member, and a second fixing
portion to be fixed to the partition member and to the optical
member is provided at another end of the fixing member.
9. The light-emitting apparatus according to claim 8, wherein the
partition member and the optical member include openings at
positions where the fixing member is provided, and the second
fixing portion passes through the openings of the partition member
and the optical member and holds the partition member and the
optical member.
10. The light-emitting apparatus according to claim 9, wherein the
fixing member includes: a first member having at one end thereof
the first fixing portion and having at another end thereof a first
screw portion; and a second member having, a second screw portion
to be screwed to the first portion provided on the first member,
and the partition member and the optical member are held by
screwing the second screw portion of the second member to the first
screw portion of the first member through the openings of the
partition member and the optical member.
11. The light-emitting apparatus according to claim 8, wherein the
board includes a third screw portion at a position where the fixing
member is provided, and the first fixing portion is a fourth screw
portion to be screwed to the third screw portion of the board.
12. The light-emitting apparatus according to claim 8, wherein the
fixing member does not protrude toward a side of a light-emitting
direction of the light-emitting apparatus from the optical
member.
13. The light-emitting apparatus according to claim 12, wherein a
concaved portion is formed on the optical member at a position
where the fixing member is provided so that the fixing member does
not protrude toward the side of the light-emitting direction from
the optical member.
14. The light-emitting apparatus according to claim 1, wherein the
fixing member is constituted by a plurality of members.
15. The light-emitting apparatus according to claim 1, where the
plurality of light source units are arranged in a matrix pattern
having N rows and M columns (where N and M are, respectively,
integers equal to or larger than 2), and the fixing ember is
provided in a central portion of the light source units arranged in
two rows and two columns.
16. The light-emitting apparatus according to claim 1, wherein the
partition member is a PET (polyethylene terephthalate) sheet or a
PC (polycarbonate) sheet.
17. The light-emitting apparatus according to claim 1, comprising a
plurality of fixing members, wherein a distance between two fixing
members that are adjacent to each other in a horizontal direction
is larger than a distance between two fixing members that are
adjacent to each other in a vertical direction.
18. An image display apparatus comprising: a light-emitting unit;
and a display unit configured to display an image by modulating
light emitted from the light-emitting unit, wherein a
light-emitting unit includes: a board on which a plurality of light
source units provided; a partition member provided on the board and
enclosing each light source unit; and a fixing member arranged in a
boundary portion between two or more light source units that are
adjacent to each other and fixing the board and the partition
member, the partition member is a sheet member which separates each
of the plurality of light source units from adjacent light source
units, in the boundary portion between the two or more light source
units, a space is formed between the partition member and the
board, and the fixing member is provided in the space.
19. The light-emitting apparatus according to claim 1, wherein the
fixing member is a rod-shaped member independent of the partition
member.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a light-emitting apparatus and an
image display apparatus.
Description of the Related Art
While cold cathode fluorescent lamps (CCFLs) have been convent ion
ally used as light sources of backlight apparatuses for liquid
crystal display apparatuses, in recent years, more and more
backlight apparatuses use light-emitting diodes (LEDs) as light
sources. Since an LED is a point light source, in a case where an
LED is used as a light source of a backlight apparatus, an
occurrence of brightness unevenness or color unevenness in light
emitted from the backlight apparatus must be suppressed by
exercising ingenuity with respect to arrangement of LEDs, a
diffusion structure of light, a reflection structure of light, and
the like. In particular, with a backlight apparatus using LEDs of a
plurality of colors such as red, green, and blue, since brightness
unevenness or color unevenness in a striped pattern or a grid
pattern is more likely to occur as compared to a backlight
apparatus using white LEDs, ingenuity must be exercised with
respect to arrangement of LEDs, a diffusion structure of light, a
reflection structure of light, and the like.
In addition, there is a technique which, taking advantage of the
fact that an LED is a point light source, individually controls
emission brightness of LEDs in order to partially change emission
brightness of a backlight apparatus and increase contrast of a
display image (an image being displayed). Such control of emission
brightness is generally referred to as local dimming control. In
local dimming control, for each of a plurality of divided regions
that constitute a region of a screen, a process is performed
involving analyzing a brightness value of image data and
controlling emission brightness of a corresponding light source
unit based on a result of the brightness value analysis.
Accordingly, contrast of a display image is improved.
As a structure for further enhancing contrast of a display image, a
structure is proposed which uses a partition member that encloses
each of a plurality of light source units corresponding to a
plurality of divided regions. A partition member can also be
described as "a member which separates each of a plurality of light
source units from other light source units". Due to such a
structure, a difference in BL brightness (emission brightness of a
backlight apparatus) between divided regions that are adjacent to
each other can be further increased and a contrast of a display
image can be further enhanced. In addition, by using a partition
member with a surface having high reflectance, a difference in BL
brightness between divided regions that are adjacent to each other
can be further increased and a contrast of a display image can be
further enhanced.
However, since light advancing from one divided region to another
divided region is blocked by the partition member, in a region
where the partition member is provided and in a vicinity thereof,
BL brightness drops to brightness that is lower than in other
regions (occurrence of brightness unevenness). In addition, in a
case where each light source unit has a plurality of light sources
with wavelengths of light that differ from each other, color
separation occurs and, accordingly, color unevenness occurs in
which a BL color (an emission color of a backlight apparatus) in a
region where the partition member is provided and in a vicinity
thereof differs from a BL color in other region.
A method for solving these problems is disclosed in, for example,
Japanese Patent Application Laid-open No. 2009-140720. The
technique disclosed in Japanese Patent Application Laid-open No.
2009-140720 uses an optical member which imparts an optical change
to incident light and a diffusing member which diffuses incident
light. The optical member is provided at a position separated from
a partition member and the diffusing member is provided on the
partition member. Light emitted from each light source unit is
diffused by the diffusing member and subsequently enters the
optical member. Due to diffusion of the light emitted from each
light source unit by the diffusing member, an occurrence of color
separation and an occurrence of color unevenness can be
reduced.
In addition, the technique disclosed in Japanese Patent Application
Laid-open No. 2005-140720 uses a fixing member which fixes the
partition member and the diffusing member. Furthermore, in the
technique disclosed in Japanese Patent Application Laid-open No.
2009-140720, a supporting portion which supports the optical member
is provided on the fixing member.
However, with the technique disclosed in Japanese Patent
Application Laid-open No. 2009-140720, in a case where a soft
member or a thin sheet-like member is used as the partition member,
an optical structure (emission characteristics) of the backlight
apparatus changes due to a weight of the diffusing member, a weight
of the partition member, and the like. For example, the optical
structure of the backlight apparatus changes due to an occurrence
of distortion of the partition member or an occurrence of a gap
(flotation) between a substrate on which the light source units and
the partition member are provided and the partition member. As a
result, an increase in brightness unevenness or color unevenness in
light emitted from the backlight apparatus, unexpected light
leakage, operational failures of various controls, image quality
deterioration of a display image, and the like occur.
SUMMARY OF THE INVENTION
The present invention provides a technique that enables a change in
emission characteristics of a light-emitting apparatus (a
light-emitting unit) to be suppressed.
A light-emitting apparatus according to the present invention
comprises:
a board on which a plurality of light source units are
provided;
a partition member provided on the board and enclosing each of the
light source units; and
a fixing member arranged in a boundary port ion between two or more
light source units that are adjacent to each other and fixing the
board and the partition member.
An image display apparatus according to the present invention
comprises:
a light-emitting unit; and
a display unit configured to display an image by modulating light
emitted from the light-emitting unit, wherein
the light-emitting unit includes:
a board on which a plurality of light source units are
provided;
a partition member provided on the board and enclosing each light
source unit; and
a fixing member arranged in a boundary portion between two or more
light source units that are adjacent to each other and fixing the
board and the partition member.
According to the present invention, a change in emission
characteristics of a light-emitting apparatus (a light-emitting
unit) can be suppressed.
Further features of the present invention will become apparent from
the following description of exemplary embodiments with reference
to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view showing an example of a configuration of
an image display apparatus according to a first embodiment;
FIG. 2 is a top view showing an example of a configuration of a
light-emitting unit according to the first embodiment;
FIG. 3 is a sectional view showing an example of a configuration of
a light-emitting unit according to the first embodiment;
FIG. 4 is a top view showing an example of a configuration of a
partition member according to the first embodiment;
FIG. 5 is a top view showing an example of a configuration of a
first optical member according to the first embodiment;
FIG. 6 is a sectional view showing an example of a configuration of
an image display apparatus according to a second embodiment;
FIG. 7 is a sectional view showing an example of a configuration of
a light-emitting unit according to the second embodiment;
FIG. 8 is a top view showing an example of a configuration of a
light-emitting unit according to a third embodiment;
FIG. 9 is a top view showing an example of brightness unevenness
which is reduced by a light-emitting unit according to the third
embodiment;
FIG. 10 is a sectional view showing an example of a configuration
of a first optical member according to the third embodiment;
FIGS. 11A and 11B are sectional views showing an example of a
configuration of a light-emitting unit according to the first
embodiment;
FIGS. 12A and 12B are top views showing an example of a
configuration of a light-emitting unit according to the first
embodiment;
FIGS. 13A and 13B are sectional views showing an example of a
configuration of a light-emitting unit according to a fourth
embodiment; and
FIG. 14 is a top view showing an example of a configuration of a
light-emitting unit according to a fifth embodiment.
DESCRIPTION OF THE EMBODIMENTS
First Embodiments
Hereinafter, a light-emitting apparatus according to a first
embodiment of the present invention will be described. The
light-emitting apparatus according to the present embodiment is a
light-emitting apparatus which enables local dimming control. The
light-emitting apparatus according to the present embodiment can be
used as, for example, a backlight apparatus for a transmission
liquid crystal display apparatus. Moreover, the light-emitting
apparatus according to the present embodiment is not limited to a
backlight apparatus. The light-emitting apparatus according to the
present embodiment can be used in any image display apparatus as
long as the image display apparatus displays an image by modulating
light from the light-emitting apparatus. For example, the
light-emitting apparatus according to the present embodiment can
even be used in a reflection liquid crystal display apparatus. The
light-emitting apparatus according to the present embodiment can
also be used in a micro electro mechanical system (MEMS) shutter
system display apparatus which uses a MEMS shutter instead of
liquid crystal elements. The light-emitting apparatus according to
the present embodiment can also be used in image display
apparatuses such as an advertisement display apparatus and a sign
display apparatus. The light-emitting apparatus according to the
present embodiment can also be used as an illumination apparatus of
a street lamp, an indoor lighting fixture, a microscope light or
the like.
FIG. 1 is a sectional view showing an example of a configuration of
an image display apparatus 100 according to the present embodiment.
FIG. 1 is a sectional view taken along a plane perpendicular to a
screen (a light-emitting surface of a light-emitting unit (a
light-emitting apparatus)). As shown in FIG. 1, the image display
apparatus 100 includes a light-emitting unit 100-1 and a display
unit 100-2. The display unit 100-2 displays an image on a screen by
transmitting light emitted from the light-emitting unit 100-1. The
light-emitting unit 100-1 includes a plurality of light source
units 101, a board 102, a partition member 103, a first optical
member 104, a first holding member 105, and a fixing member 109.
The display unit 100-2 includes a second optical member 106, a
liquid crystal panel 107, and a second holding member 108.
Moreover, the liquid crystal panel 107 may be perceived as the
display unit 100-2. In addition, at least one of the second optical
member 106 and the second holding member 108 may be perceived as a
member of the light-emitting unit 100-1.
For example, the board 102 includes a circuit substrate on which a
circuit is formed, a heat-dissipating substrate which releases heat
of the image display apparatus 100 or the light-emitting unit 100-1
to the outside, and a thermally conductive sheet which electrically
insulates the circuit substrate from the heat-dissipating
substrate. For example, a circuit which supplies each light source
unit 101 with a drive signal for driving each light source unit 101
is formed on the circuit substrate. For example, a metallic
substrate is used as the heat-dissipating substrate. The thermally
conductive sheet is sandwiched between the circuit substrate and
the heat-dissipating substrate.
The plurality of light source units 101 are provided on the board
102. FIG. 2 is a top view of the light-emitting unit 100-1 as seen
from a side of the light-emitting surface. In FIG. 2, the first
optical member 104 and the first holding member 105 have been
omitted. In the present embodiment, the plurality of light source
units 101 are arranged in a matrix pattern having N rows and M
columns (where N and M are, respectively, integers equal to or
larger than 2). Specifically, as shown in FIG. 2, nine light source
units 101 in three rows and three columns are provided on the board
102. A screen region is associated with each light source unit. For
example, nine divided regions in three rows and three columns which
constitute a screen region are determined in advance and the nine
light source units 101 are respectively associated with the nine
divided regions. Moreover, the number and arrangement of the light
source units 101 are not particularly limited. For example, there
may be more or less than nine light source units 101. The plurality
of light source units 101 may be arranged in a staggered
pattern.
Each light source unit 101 has a plurality of light sources. For
example, each light source unit 101 has two or more types of light
source with light wavelengths (colors) that differ from each other.
As shown in FIGS. 1 and 2, in the present embodiment, each light
source unit 101 has three light sources--an R light source, a G
light source, and a B light source--which are arranged in one
direction. The R light source (the light source denoted by "R" in
FIGS. 1 and 2) emits red light. The G light source (the light
source denoted by "G" in FIGS. 1 and 2) emits green light. In
addition, the B light source (the light source denoted by "B" in
FIGS. 1 and 2) emits blue light. As the light sources, a
light-emitting diode (LED), an organic EL element, a laser element,
a cold cathode tube, or the like can be used. Moreover, the number,
the type, and an arrangement of the light sources are not
particularly limited. For example, each light source unit 101 may
include more or less than three light sources. Each light source
unit 101 may include one light source. Each light source unit 101
may include a plurality of light sources arranged in a matrix
pattern. Each light source unit 101 may include a plurality of
light sources of a same type.
The partition member 103 is provided on the board 102. While a
material of the partition member 103, a shape of the partition
member 103, and the like are not particularly limited, for example,
a PET (polyethylene terephthalate) sheet, a PC (polycarbonate)
sheet, or the like is used as the partition member 103. The
partition member 103 has a shape which encloses each light source
unit 101 on a plane parallel to the screen. A plane parallel to the
screen can also be described as "a plane parallel to the
light-emitting surface", "a plane parallel to the board 102", and
the like. The partition member 103 can also be described as "a
member which separates each of the plurality of light source units
101 from other light source units 101". Light advancing from one
light source unit 101 to an adjacent light source unit 101 is
blocked by the partition member 103. Accordingly, during local
dimming control in which emission brightness of each light source
unit 101 is individually controlled, a difference in brightness of
the light-emitting surface (emission brightness of the
light-emitting unit 100-1) between divided regions that are
adjacent to each other can be further increased and a contrast of a
display image can be further enhanced. In addition, by using a
member with a surface having high reflectance as the partition
member 103, light advancing from one light source unit 101 to an
adjacent light source unit 101 can be efficiently reflected by the
partition member 103 toward a side of the light-emitting surface.
As a result, during local dimming control, a difference in
brightness of the light-emitting surface between divided regions
that are adjacent to each other can be further increased and a
contrast of a display image can be further enhanced.
Moreover, in a case where the light-emitting apparatus (the
light-emitting unit 100-1) according to the present embodiment is a
light-emitting apparatus for an image display apparatus, a size and
an arrangement of the partition member 103 are favorably determined
so that a screen region (a display region) is enclosed by an
outline of the partition member 103 on a plane parallel to the
screen.
The first optical member 104 imparts an optical change to incident
light having entered the first optical member 104 in a case where
the incident light is transmitted through the first optical member
104. For example, light from each light source unit 101 enters the
first optical member 104. The first optical member 104 includes at
least a diffusing member (a diffusing plate, a diffusing sheet, or
the like) which diffuses incident light. The first optical member
104 is provided on the partition member 103. While a shape of the
first optical member 104 is not particularly limited, in the
present embodiment, a plate-like member is used as the first
optical member 104.
Moreover, the first optical member 104 may further include at least
one of a condensing member (a condensing plate, a condensing sheet,
or the like) and a polarizing member (a polarizing plate, a
polarizing sheet, or the like). The first optical member 104 may
include an optical member other than a condensing member and a
polarizing member. The condensing member condenses incident light
having entered at various angles of incidence in a light-emitting
direction of the light-emitting unit 100-1. The polarizing member
polarizes incident light. The light-emitting direction of the
light-emitting unit 100-1 is a direction perpendicular to the
light-emitting surface and is a direction oriented from the
light-emitting unit 100-1 toward the display unit 100-2. Since a
screen-side surface is a front of the image display apparatus 100,
the light-emitting direction of the light-emitting unit 100-1 can
also be described as "a front direction".
The first holding member 105 is a supporting member which holds an
edge portion of the partition member 103 and an edge portion of the
first optical member 104.
The fixing member 109 fixes the board 102, the partition member
103, and the first optical member 104. The fixing member 109 can
also be described as "a member which suppresses degrees of freedom
of the partition member 103 and the first optical member 104 with
respect to the board 102". In the present embodiment, as shown in
FIG. 2, the fixing member 109 is provided in a central portion of
four light source units that are adjacent to each other and which
are arranged in two rows and two columns. Details of a fixing
method used by the fixing member 109 will be provided later.
Moreover, a material of the fixing member 109 is not particularly
limited. For example, as the fixing member 109, a resin member may
be used or a metallic member may be used. In addition, while the
fixing member 109 is provided in all of the central portions
described earlier in FIG. 2, the fixing member 109 may be provided
in a part of the central portions. Furthermore, optical sensors may
be provided in a part of the central portions where the fixing
member 109 is not provided. For example, an optical sensor is used
for detecting light emitted from each light source unit. As the
optical sensor, a brightness sensor which detects brightness of
light, a color sensor which detects a color of light, a sensor
which detects both the brightness and the color of light, and the
like can be used. Moreover, while also dependent on strength of the
partition member 103 and the like, one fixing member 109 may be
provided with respect to light source units arranged in nine rows
and nine columns.
The second optical member 106 imparts an optical change to incident
light having entered the second optical member 106 in a case where
the incident light is transmitted through the second optical member
106. For example, light emitted from each light source unit 101 and
transmitted through the first optical member 104 enters the second
optical member 106. In addition, light emitted from each light
source unit 101 and transmitted through the first optical member
104 and the second optical member 106 enters the liquid crystal
panel 107. The second optical member 106 is provided on a side of
the front direction with respect to the partition member 103 so as
to be separated from the partition member 103. While a shape of the
second optical member 106 is not particularly limited, in the
present embodiment, a plate-like member is used as the second
optical member 106. For example, the second optical member 106
includes at least one of a diffusing member (a diffusing plate, a
diffusing sheet, or the like), a condensing member (a condensing
plate, a condensing sheet, or the like) and a polarizing member (a
polarizing plate, a polarizing sheet, or the like). Moreover, the
second optical member 106 may include an optical member other than
a diffusing member, a condensing member, and a polarizing
member.
In the present embodiment, an optical change is imparted by the
first optical member 104 and the second optical member 106 to light
emitted from a plurality of light source units 101. For example,
light emitted from a plurality of light source units 101 is
diffused by the first optical member 104 and the second optical
member 106. Accordingly, brightness unevenness and color unevenness
of light incident to the liquid crystal panel 107 can be reduced.
Generally, assuming that a position of the second optical member
106 is constant, the closer the first optical member 104 is to the
board 102 (the plurality of light source units 101), the greater
the reduction in brightness unevenness and color unevenness. In
addition, assuming that the position of the second optical member
106 is constant, the closer the first optical member 104 is to the
second optical member 106, the higher the value of increased
contrast of a display image.
The liquid crystal panel 107 displays an image on a screen by
transmitting light incident to the liquid crystal panel 107. The
liquid crystal panel 107 includes a plurality of liquid crystal
elements. Transmittance of each liquid crystal element is
controlled based on image data output from an image output
apparatus (not illustrated). The image is displayed on the screen
as light incident to the liquid crystal panel 107 is transmitted
through each liquid crystal element at transmittance based on the
image data.
The second holding member 108 is a supporting member which holds an
edge portion of the second optical member 106 and an edge portion
of the liquid crystal panel 107. Due to the second holding member
108, a distance (interval) between the second optical member 106
and the liquid crystal panel 107 is kept at a constant
distance.
Next, a specific example of a fixing method used by the fixing
member 109 will be described with reference to FIGS. 3 to 5. FIG. 3
is a sectional view of the light-emitting unit 100-1 at a position
where the fixing member 109 is to be provided. FIG. 4 is a top view
of the partition member 103 at a position where the fixing member
109 is to be provided. FIG. 5 is a top view of the first optical
member 104 at a position where the fixing member 109 is to be
provided.
In the present embodiment, as shown in FIG. 3, a sheet-like member
is used as the partition member 103. A thickness of the partition
member 103 is, for example, around 0.1 to 2 mm (the thickness of
the partition member 103 is not limited to this example). In
addition, as shown in FIG. 3, a space is formed by the partition
member 103 and the board 102 at a boundary portion between the
plurality of light source units 101. Furthermore, as shown in FIG.
3, the fixing member 109 is provided in this space.
While a shape of the fixing member 109 is not particularly limited,
in the present embodiment, a rod-like member is used as the fixing
member 109. In addition, in the present embodiment, a first fixing
portion to be fixed to the board 102 is provided at one end of the
fixing member 109. Specifically, as shown in FIG. 3, a male screw
109e (a fourth screw portion) with a length of s7 is formed as the
first fixing portion at one end of the fixing member 109.
Furthermore, a female screw (a third screw portion) with a depth of
s7 is formed in the board 102 at a position where the fixing member
109 is to be provided. The male screw 109e of the fixing member 109
is screwed into the female screw of the board 102. Accordingly, the
fixing member 109 is fixed to the board 102.
Moreover, the depth of the female screw of the board 102 need only
be greater than s7. In addition, although an example in which the
third screw portion is a female screw and the fourth screw portion
is a male screw has been described in the present embodiment, the
third screw portion may be a male screw and the fourth screw
portion may be a female screw.
Moreover, the method of fixing the fixing member 109 to the board
102 is not particularly limited. For example, a con vexed portion
may be formed as the first fixing portion. In addition, an opening
into which the convexed portion can be inserted may be formed on
the board 102. Treatment for suppressing detachment of the convexed
portion from the opening may be performed on a protruding portion
of the convexed portion (a portion protruding from the board 102
(the opening)) in a case where the convexed portion is inserted
into the opening. Accordingly, the fixing member 109 can be fixed
to the board 102. The treatment for suppressing detachment of the
convexed portion from the opening is treatment in which a member
larger than the opening is fixed to the protruding portion,
treatment in which the protruding portion is deformed to a size
that is larger than the opening, or the like. The fixing member 109
may be fixed to the board 102 using an adhesive. The fixing member
109 may be fixed to the board 102 using a rivet. The fixing member
109 may be welded to the board 102 using a rivet bit or the
like.
In the present embodiment, a second fixing portion to be fixed to
the partition member 103 and the first optical member 104 is
provided at another end of the fixing member 109. In the present
embodiment, as shown in FIG. 4, an opening 103a is formed on the
partition member 103 at a position where the fixing member 109 is
to be provided. Specifically, the partition member 103 has a planar
portion that is parallel to the screen at a position where the
fixing member 109 is to be provided, and the opening 103a is formed
in this planar portion. In addition, as shown in FIG. 5, an opening
104a is also formed on the first optical member 104 at a position
where the fixing member 109 is to be provided. Furthermore, as
shown in FIG. 3, the second fixing portion passes through the
opening 103a of the partition member 103 and the opening 104a of
the first optical member 104 and holds the partition member 103 and
the first optical member 104. In FIG. 3, the second fixing portion
includes an upper head portion 109a, a passing portion 109b, and a
lower head portion 109c. The upper head portion 109a is a portion
which presses the first optical member 104 from a downstream side
in the light-emitting direction with respect to the first optical
member 104. The passing portion 109b is a portion which passes
through the openings 103a and 104a. The lower head portion 109c is
a portion which presses the partition member 103 from an upstream
side in the light-emitting direction with respect to the partition
member 103.
A diameter h1 of the opening 103a, a diameter h2 of the opening
104a, and a diameter s2 of the passing portion 109b satisfy a
relationship expressed by Expression 1 below. Moreover, as long as
the passing portion 109b can be passed through the openings 103a
and 104a, a shape of the opening 103a, a size of the opening 103a,
a shape of the opening 104a, a size of the opening 104a, a shape of
the passing portion 109b, and a size of the passing portion 109b
are not particularly limited. s2<h1.apprxeq.h2 (Expression
1)
In addition, a width s1 of the upper head portion 109a is larger
than the diameter h2 of the opening 104a and a width s4 of the
lower head portion 109c is larger than the diameter h1 of the
opening 103a. Furthermore, a distance s3 from a lower end (an
upstream-side end in the light-emitting direction) of the upper
head portion 109a to an upper end (a downstream-side end in the
light-emitting direction) of the lower head portion 109c, a
thickness r1 of the partition member 103, and a thickness m1 of the
first optical member 104 satisfy a relationship expressed by
Expression 2 below. This relationship enables the fixing member 109
to be also fixed to the partition member 103 and the first optical
member 104. As a result, degrees of freedom of the partition member
103 and the first optical member 104 with respect to the board 102
can be suppressed. s3=r1+m1 (Expression 2)
In addition, in the example shown in FIG. 3, a height w1 of the
partition member 103, a thickness s5 of the lower head portion
109c, a length s6 of an intermediate portion 109d of the fixing
member 109, and the thickness r1 of the partition member 103
satisfy a relationship expressed by Expression 3 below. w1=s5+s6+r1
(Expression 3)
Moreover, the method of fixing the fixing member 109 to the
partition member 103 and the first optical member 104 is not
particularly limited. For example, the fixing member 109 may be
fixed to the partition member 103 and the first optical member 104
using a screw. The fixing member 109 may be fixed to the partition
member 103 and the first optical member 104 using an adhesive. The
fixing member 109 may be fixed to the partition member 103 and the
first optical member 104 using a rivet. The fixing member 109 may
be welded to the partition member 103 and the first optical member
104 using a rivet bit or the like.
As described above, according to the present embodiment, the board
102, the partition member 103, and the first optical member 104 are
fixed by the fixing member 109. Accordingly, deformation of the
partition member 103 attributable to a force (pressure or the like)
applied to the partition member 103 from the first optical member
104 can be suppressed. In addition, deformation of the partition
member 103 attributable to other forces and impact applied to the
partition member 103 can be suppressed. As a result, a change in
emission characteristics of the light-emitting apparatus (the
light-emitting unit 100-1) can be suppressed. By extension, an
increase in brightness unevenness or color unevenness in light
emitted from the light-emitting apparatus, an occurrence of
unexpected light leakage, occurrences of operational failures of
various controls, and the like can be suppressed. Furthermore, in a
case where the light-emitting apparatus is used in an image display
apparatus, by suppressing a change in emission characteristics,
image quality deterioration of a display image can be
suppressed.
Moreover, a structure of the partition member 103 is not
particularly limited. For example, as shown in FIGS. 11A and 11B, a
space may not be formed by the partition member 103 and the board
102. In addition, the method of fixing used by the fixing member
109 is not particularly limited. For example, as shown in FIG. 11A,
the fixing member 109 may be fixed to the board 102 through
openings of the partition member 103 and the first optical member
104. Specifically, the fixing member 109 may be fixed to the board
102 through a through-hole 103b formed in the partition member 103
and the opening 104a formed on the first optical member 104. The
"through-hole 103b into which the fixing member 109 is inserted"
can also be described as a "space formed by the partition member
103 and the board 102". In the example shown in FIG. 11A, the
partition member 103 and the first optical member 104 are
sandwiched by the fixing member 109 and the board 102. Such a
structure can be applied in a case where, for example, the
partition member 103 requires the use of a material with high
thermal conductivity for the purpose of heat dissipation of the
light source unit 101. In addition, such a structure can also be
applied in a case where the partition member 103 requires the use
of a material with high shielding performance as a countermeasure
implemented by the light source unit 101 against electromagnetic
waves that affect the liquid crystal panel 107. As described above,
the structure shown in FIG. 11A is effective in terms of
suppressing distortion of the partition member 103 in a case where
the partition member 103 is made of an elastic material or in a
case where the partition member 103 is made of a soft material such
as a foamable material. Furthermore, as shown in FIG. 11B, the
board 102, the partition member 103, and the first optical member
104 may be fixed by having the fixing member 109 hold the board
102, the partition member 103, and the first optical member
104.
Moreover, a position of the fixing member 109 is not particularly
limited. For example, as shown in FIG. 12A, the fixing member 109
may be provided in a boundary portion between two light source
units 101 which are arranged side by side in a row direction and
which are adjacent to each other. As shown in FIG. 12B, the fixing
member 109 may be provided in a boundary portion between two light
source units 101 which are arranged side by side in a column
direction and which are adjacent to each other.
Second Embodiment
Hereinafter, a light-emitting apparatus according to a second
embodiment of the present invention will be described. In the first
embodiment, an example in which a fixing member is constituted by a
single member has been described. In the present embodiment, an
example in which a fixing member is constituted by a plurality of
members will be described. Moreover, same members as in the first
embodiment will be assigned same reference characters as the first
embodiment and descriptions thereof will be omitted.
FIG. 6 is a sectional view showing an example of a configuration of
an image display apparatus 200 according to the present embodiment.
As shown in FIG. 6, in the present embodiment, a fixing member
includes a first member 211 and a second member 212.
FIG. 7 is a sectional view of a light-emitting unit 200-1 at a
position where the fixing member is to be provided. In the present
embodiment, as shown in FIG. 7, a male screw 211b (a fourth screw
portion) is formed as a first fixing portion at one end of the
first member 211. In addition, a female screw (a third screw
portion) is formed in the board 102 at a position where the fixing
member is to be provided. The male screw 211b of the first member
211 is screwed into the female screw of the board 102. Accordingly,
the fixing member is fixed to the board 102.
Moreover, the method of fixing the fixing member to the board 102
is not particularly limited. For example, the fixing member may
include a third member. An opening may be formed in the board 102
at a position where the fixing member is to be provided. In
addition, the board 102 may be sandwiched by the first member 211
and the third member through the opening of the board 102. As a
method of sandwiching the board 102 with the first member 211 and
the third member, a method using a screw, a method using a pin, a
method using a rivet, or the like can be used.
In the example shown in FIG. 7, a length o3 of a spacer portion
211a of the first member 211, a distance w2 from an upper end of
the board 102 to a lower end of the first optical member 104, and
the thickness r1 of the partition member 103 satisfy a relationship
expressed by Expression 4 below. The spacer portion 211a is a
portion excluding the male screw 211b from the first member 211.
o3=w2-r1 (Expression 4)
In addition, in the present embodiment, as shown in FIG. 7, a
female screw (a first screw portion) is formed at another end of
the first member 211. A male screw (a second screw portion) which
is to be screwed into the female screw of the first member 211 is
formed on the second member 212. In addition, in a similar manner
to the first embodiment, openings are formed in the partition
member 103 and the first optical member 104 at positions where the
fixing member is to be provided. Furthermore, as shown in FIG. 7,
the partition member 103 and the first optical member 104 are
sandwiched as the male screw of the second member 212 is screwed
into the female screw of the first member 211 through the openings
of the partition member 103 and the first optical member 104.
As shown in FIG. 7, a width (a diameter) o2 of the first member 211
is larger than a diameter of the opening formed in the partition
member 103 and a width o1 of a head portion 212a of the second
member 212 is larger than a diameter of the opening formed in the
first optical member 104. This relationship enables the partition
member 103 and the first optical member 104 to be sandwiched by the
first member 211 and the second member 212. In other words, the
fixing member can also be fixed to the partition member 103 and the
first optical member 104. As a result, degrees of freedom of the
partition member 103 and the first optical member 104 with respect
to the board 102 can be suppressed.
Moreover, although an example in which the first screw portion is a
female screw and the second screw portion is a male screw has been
described in the present embodiment, the first screw portion may be
a male screw and the second screw portion may be a female screw. In
addition, the method of fixing the fixing member 109 to the
partition member 103 and the first optical member 104 is not
particularly limited. For example, the first member 211 and the
second member 212 may be joined using a pin. The first member 211
and the second member 212 may be joined using a rivet.
As described above, according to the present embodiment, the board
102, the partition member 103, and the first optical member 104 are
fixed by the fixing member. Accordingly, a change in emission
characteristics of the light-emitting apparatus (the light-emitting
unit 200-1) can be suppressed. In addition, according to the
present embodiment, the fixing member is constituted by a plurality
of members. Accordingly, a reduction in manufacturing cost of the
light-emitting apparatus can be achieved. For example, in the first
embodiment, since the shape of the fixing member is complex, a
custom-made item must be prepared as the fixing member. On the
other hand, in the present embodiment, the fixing member may be
realized by combining commercially available items. For example, a
commercially available spacer can be used as the first member 211
and a commercially available screw, pin, rivet, or the like can be
used as the second member 212. The use of commercially available
items enables manufacturing cost of the light-emitting apparatus to
be reduced. In addition, by configuring the fixing member using a
plurality of members, assembly and disassembly of the
light-emitting apparatus can be readily performed.
Third Embodiment
Hereinafter, a light-emitting apparatus according to a third
embodiment of the present invention will be described. In the
present embodiment, a configuration that enables a further
reduction in brightness unevenness or color unevenness of light
emitted from a light-emitting apparatus will be described. In a
case where the light-emitting apparatus is used in an image display
apparatus, by reducing brightness unevenness or color unevenness of
light emitted from the light-emitting apparatus, image quality of a
display image is improved. Moreover, while an example in which a
characteristic configuration of the present embodiment is combined
with the configuration of the second embodiment will be described
in the present embodiment, the characteristic configuration of the
present embodiment may also be combined with the configuration of
the first embodiment. In addition, same members as in the first and
second embodiments will be assigned same reference characters as
the first embodiment and descriptions thereof will be omitted.
FIG. 8 is a top view showing an example of a configuration of a
light-emitting unit according to the present embodiment. In FIG. 8,
the first optical member has been omitted. In the first and second
embodiments, a fixing member protrudes toward a side of a
light-emitting direction from a first optical member (FIGS. 1 and
6). In this case, a part of light emitted from each light source
unit 101 and transmitted through the first optical member is
reflected by the fixing member or absorbed by the fixing member. As
a result, brightness unevenness or color unevenness of light
emitted from the light-emitting apparatus occurs as shown in FIG.
9. For example, brightness unevenness occurs in which brightness
declines at a position where the fixing member is provided. Such
brightness unevenness can be reduced by increasing a distance from
the first optical member to a light-emitting surface (for example,
the second optical member 106). However, increasing the distance
from the first optical member to the light-emitting surface results
in an increase in thickness of the apparatus (the light-emitting
apparatus the image display apparatus, or the like), a decline in
contrast of a display image, and the like and is therefore
unfavorable.
In consideration thereof, in the present embodiment, a structure in
which the fixing member does not protrude toward a side of the
light-emitting direction from the first optical member is adopted.
For example, a concaved portion is formed on the first optical
member so that the fixing member does not protrude from the first
optical member. The concaved portion is formed at a position where
the fixing member is to be provided. FIG. 10 is a sectional view
showing an example of a configuration of a first optical member 304
according to the present embodiment. FIG. 10 is a sectional view at
a position where the fixing member is to be provided. In the
present embodiment, as shown in FIG. 10, a concaved portion 304a
with a similar shape to a head portion 312a of a second member 312
is formed in a first optical member 304. Accordingly, in a case
where the second member 312 is joined with the first member, the
fixing member (the second member 312) no longer protrudes from the
first optical member 304. As a result, brightness unevenness or
color unevenness of light emitted from the light-emitting apparatus
can be further reduced.
Moreover, any structure may be adopted as long as the structure
prevents the fixing member from protruding toward a side of the
light-emitting direction from the first optical member. For
example, the fixing member may be welded to the partition member
and the first optical member so that the fixing member does not
protrude toward a side of the light-emitting direction from the
first optical member. After the fixing member is welded to the
partition member and the first optical member, a portion (a
protruding portion) which protrudes toward a side of the
light-emitting direction from the first optical member may be
removed from the fixing member. The protruding portion may be
removed by, for example, melting, polishing, cutting, or the
like.
Moreover, favorably, a reflecting sheet is pasted on an upper
surface (a surface on a side of the light-emitting direction) of
the fixing member or a material similar to that of the first
optical member (for example, resin) is used as a material of the
fixing member. In addition, a countersunk head screw, a hexagon
head bolt, a self-drilling tapping screw, or the like is favorably
used as the second member. Accordingly, brightness unevenness or
color unevenness of light emitted from the light-emitting apparatus
can be further reduced. For example, by using a material similar to
that of the first optical member as the material of a fixing
member, since a fixing member producing similar optical performance
to the first optical member can be realized, brightness unevenness
or color unevenness can be further reduced.
As described above, according to the present embodiment, since the
fixing member does not protrude toward a side of the light-emitting
direction from the first optical member, brightness unevenness or
color unevenness of light emitted from the light-emitting apparatus
can be further reduced.
Fourth Embodiment
Hereinafter, a light-emitting apparatus according to a fourth
embodiment of the present invention will be described. In the
first, second, and third embodiments, examples have been described
in which a fixing member passes through openings of a partition
member and an optical member and holds both the partition member
and the optical member. In the present embodiment, an example will
be described in which, while a fixing member passes through an
opening of a partition member and holds the partition member, an
opening is not formed on an optical member and the fixing member
fixes and supports the optical member from below. Moreover, same
members as in the first, second, and third embodiments will be
assigned same reference characters as the first embodiment and
descriptions thereof will be omitted.
FIGS. 13A and 13B are sectional views showing an example of a
configuration of a light-emitting unit according to the present
embodiment. While an opening is formed in an optical member in the
first, second, and third embodiments, optical members are often
constituted by a resin plate and forming an opening in the resin
plate requires machining. Since a scratch, an indentation, or the
like attributable to machining has an adverse effect on optical
characteristics, the machining must be performed so that a scratch,
an indentation, or the like is not created. However, machining
performed so that a scratch, an indentation, or the like is not
created causes a decline in yield, an increase in cost, and the
like. In addition, in a case where a plurality of fixing members
are used, the plurality of fixing members restrain an optical
member at a plurality of locations. Therefore, with a method of
forming an opening in an optical member, fixing of the optical
member by a plurality of fixing members may cause an occurrence of
distortion of the optical member or may adversely affect optical
characteristics unless dimensions and positions of the respective
fixing members are strictly managed.
In consideration thereof, in the present embodiment, a fixing
structure is adopted in which distortion of an optical member is
suppressed by not forming an opening in the optical member. In FIG.
13A, an optical member 104 is placed on a head portion 212a of a
second member 212 which is included in the fixing member 109. In
other words, the head portion 212a of the second member 212 fixes
the partition member 103 to the spacer portion 211a of the first
member 211 which is included in the fixing member 109 and, at the
same time, supports the optical member 104 from below. The head
portion 212a fixing the optical member 104 and the head portion
212a supporting the optical member 104 from below are approximately
synonymous with respect to an effect of "suppressing distortion of
the partition member 103". Moreover, an up and down direction in
this case are the same as an up and down direction in FIG. 13A.
Therefore, "supporting the optical member 104 from below" means
"supporting the optical member 104 from a side of the light source
unit 101". As an installation mode of an image display apparatus,
generally, horizontal installation in which the liquid crystal
panel 107 faces upward or vertical installation in which the liquid
crystal panel 107 faces a user is adopted. Therefore, by having the
head portion 212a support the optical member 104 from a side of the
light source unit 101, distortion of the partition member 103 can
be sufficiently suppressed. In addition, distortion of the optical
member 104 can also be sufficiently suppressed.
Obviously, the optical member 104 may be fixed to the head portion
212a by adhesion at locations where the head portion 212a and the
optical member 104 come into contact with each other. As a method
of adhesion, adhesion using an adhesive, bonding using an adhesive
tape, or the like can be used. In such cases, the adhesive, the
adhesive tape, or the like performs a role of absorbing a
dimensional difference of the fixing member 109. In addition, while
an example in which the fixing member 109 is constituted by a
plurality of members has been described in the present embodiment,
the fixing member 109 may be constituted by a single member.
Furthermore, while the second member 212 has been described as a
screw in the present embodiment, the second member 212 is not
limited to a screw. Moreover, a shape of the head portion 212a of
the screw is not limited to a spherical shape (an arc shape in a
sectional view). For example, the head portion 212a may have a
planar shape or other shapes.
Next, in FIG. 13B, the optical member 104 is arranged with a
clearance on the head portion 212a of the second member 212 which
is included in the fixing member 109. Therefore, while the head
portion 212a supports the optical member 104 in close contact in
FIG. 13A, the head portion 212a is arranged with a clearance below
the optical member 104 in FIG. 13B. As shown in FIG. 1, the optical
member 104 is held and fixed by the first holding member 105. In
FIG. 13B, the optical member 104 is held while allowing deflection
in an amount corresponding to the clearance. The structure shown in
FIG. 13B can be described as "a configuration which suppresses an
amount of deflection (by an amount corresponding to the clearance).
The structure shown in FIG. 13A and the structure shown in FIG. 13B
produce similar effects in terms of preventing distortion of the
partition member 103.
The optical member 104 is arranged with a clearance on the head
portion 212a. Therefore, a length t1 of the spacer portion 211a of
the first member 211, a length (a thickness) t2 of the head portion
212a of the second member 212, a distance w3 from the upper end of
the board 102 to the lower end of the optical member 104, and the
thickness r1 of the partition member 103 satisfy a relationship
expressed by Expression 5 below. w3>t1+r1+t2 (Expression 5)
The clearance (w3-t1+r1+t2) expressed by Expression 5 is not
particularly limited. However, in order to prevent the optical
member 104 from deflecting significantly in a case where some kind
of an external force is applied to the optical member 104, the
clearance desirably has a maximum value of around 5 mm. Whether or
not the fixing member 109 is to be brought into close contact with
the optical member 104, how much clearance is to be provided
between the fixing member 109 and the optical member 104 in a case
where such clearance is to be provided, and the like are to be
determined as appropriate. For example, these determinations may be
made based on a size of the screen, a size of the optical member
104, a thickness of the optical member 104, and the like. "Whether
or not the fixing member 109 is to be brought into close contact
with the optical member 104" may also be described as "which of the
structure shown in FIG. 13A and the structure shown in FIG. 13B is
to be adopted" and "a case where such clearance is to be provided
between the fixing member 109 and the optical member 104" may also
be described as "a case where the structure shown in FIG. 13B is
adopted".
Fifth Embodiment
Hereinafter, a light-emitting apparatus according to a fifth
embodiment of the present invention will be described. In the
present embodiment, an arrangement and the number of fixing members
109 which enable distortion of the partition member 103 to be
further suppressed and which enable flotation of the partition
member 103 (a lower portion of the partition member 103) with
respect to the board 102 to be further suppressed will be
described.
FIG. 14 is a top view showing an example of a configuration of a
light-emitting unit according to the present embodiment. In FIG.
14, in both a row direction and a column direction, a plurality of
fixing members 109 are symmetrically arranged with respect to a
center of the board 102 (the board 102, the partition member 103,
or the optical member 104) and the plurality of fixing members 109
are arranged at equal distances. In this case, the row direction is
the same as a horizontal direction (a left and right direction) in
FIG. 14 and the column direction is the same as a vertical
direction (an up and down direction) in FIG. 14. While in FIG. 14
the fixing members 109 are provided in central portions of light
source units 101 arranged in two rows and two columns, this
arrangement is not restrictive. The fixing members 109 may be
provided in a boundary portion between two light source units 101
which are arranged side by side in the row direction or the column
direction. Even in this case, the plurality of fixing members 109
are arranged symmetrically and at equal distances in both the row
direction and the column direction.
A structure in which one fixing member 109 is arranged at a center
of one partition member 103 is conceivable as an apparatus
structure. However, in order to further suppress distortion of the
partition member 103 and flotation between the lower portion of the
partition member 103 and the board 102, favorably, four or more
fixing members 109 satisfying the arrangement described above in
which the fixing members 109 are arranged "symmetrically and at
equal distances" are used with respect to one partition member 103.
Generally, a shape of the liquid crystal panel 107 (screen) is not
a square but a rectangle. Therefore, the board 102, the partition
member 103, the optical member 104, and the like inevitably assume
rectangular shapes (as viewed from a direction perpendicular to the
screen). Accordingly, the number of the fixing members 109 in a
long side direction among the row direction and the column
direction is reasonably larger than the number of the fixing
members 109 in a short side direction among the row direction and
the column direction. The long side direction is a direction along
a long side of the board 102, the partition member 103, the optical
member 104, the liquid crystal panel 107, or the like and the short
side direction is a direction along a short side of the board 102,
the partition member 103, the optical member 104, the liquid
crystal panel 107, or the like.
Furthermore, in order to further suppress distortion of the
partition member 103 and flotation between the lower portion of the
partition member 103 and the board 102, favorably, the plurality of
fixing members 109 are arranged so as to satisfy a condition
described below. In the following condition, "m" denotes the number
of fixing members 109 in the row direction (horizontal direction)
and "n" denotes the number of fixing members 109 in the column
direction (vertical direction).
Condition:ratio (n-1):(m-1) is approximately the same as an aspect
ratio of the optical member 104 (the board 102, the partition
member 103, the optical member 104, or the liquid crystal panel
107).
In FIG. 14, a size of the board 102, a size of the partition member
103, a size of the optical member 104, and a size of the liquid
crystal panel 107 are approximately the same and aspect ratios
thereof are approximately 2:3. In addition, four fixing members 109
are arranged in the row direction and three fixing members 109 are
arranged in the column direction. Therefore,
(n-1):(m-1)=(3-1):(4-1)=2:3 is satisfied. Obviously, the number and
the arrangement of the fixing members 109 are not limited to the
above. For example, seven fixing members 109 may be arranged in the
row direction and five fixing members 109 may be arranged in the
column direction. Ten fixing members 109 may be arranged in the row
direction and seven fixing members 109 may be arranged in the
column direction. Even in these cases, (n-1):(m-1)=2:3 is
satisfied. In FIG. 14, the fixing members 109 are arranged in
central portions of respective regions made up of 24 light source
units 101 arranged in six rows and four columns. In addition, a
distance between two fixing members 109 that are adjacent to each
other in the horizontal direction is larger than a distance between
two fixing members 109 that are adjacent to each other in the
vertical direction.
As described above, according to the present embodiment, by
adopting the number and the arrangement described above as the
number and the arrangement of the fixing members 109, distortion of
the partition member 103 and flotation between the lower portion of
the partition member 103 and the board 102 can be further
suppressed.
Although preferred embodiments of the present invention have been
described above, it is to be understood that the present invention
is not limited to such embodiments and various modifications and
changes may be implemented without departing from the spirit and
scope of the present invention.
While the present invention has been described with reference to
exemplary embodiments, it is to be understood that the invention is
not limited to the disclosed exemplary embodiments. The scope of
the following claims is to be accorded the broadest interpretation
so as to encompass all such modifications and equivalent structures
and functions.
This application claims the benefit of Japanese Patent Application
No. 2015-158721, filed on Aug. 11, 2015, and Japanese Patent
Application No. 2016-117664, filed on Jun. 14, 2016, which are
hereby incorporated by reference herein in their entirety.
* * * * *